Ore-stamp battery



(No Model.)

J. M. MGFARLAND- ORE STAMP BATTERY.

No. 268,115. Patented Nov. 28, 1882.

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UNITED STATES PATENT. OFFICE.

JAMES M. MOFARLAND, OF VIRGINIA CITY, NEVADA.

ORE-STAM P BATTERY.

SPECIFICATION forming part of Letters Patent No. 268,115, dated November 28, 1882.

V Application filed June 23,1882. (No model.)

vada, have invented an Improvement; in Ore- Stamp Batteries; and I hereby declare the following to be a full, clear, and exact description thereof. I

My invention relates to certain new and usefnl improvements in ore-stamp batteries.

It consists in the provision of a peculiar speeding device having two arms, one of which is acted upon by the revolving cam and the other acts upon the tappet, as will be more fully described.

In the ordinary form of stamp-battery, in which the stamp is raised and dropped by a revolving cam acting under and upon a tappet upon the stamp-stem, a difficulty found to exist is that when the cam is revolved above a certain rate of speed it makes its revolution and catches the tappet before the stamp has had time to strike the die.

The object of my invention is to overcome this difficulty by providing a means for speeding the stamp,whereby it will be impossible for the cam to reach the tappet before the stamp has reached its limit of descent.

Referring to the accompanying drawings, Figure l is a perspective view of stamp and operating devices. Fig. 2 is a cross-section showing the stamp in a lowered position.

A represents suitable frame-work, provided with cross-guides B. It is usual in ore-batteries to have a number of stamps-say five or tenin each. These are adapted to fall upon dies within a mortar into which the ore is fed.

For the purpose of explaining my invention I have here need to show but one stamp, 0, adapted to fall upon a die, D.

E is a stamp stem, passing up through guides B and provided with the tappet-F.

G is the cam-shaft, driven by suitable power, as by a belt to a pulley, H. It carries the cam I, which, by the revolution of the shaft, is brought under the tappet F to raise it and the stamp. By continuing-its revolution it relieves the tappet, and the stamp drops.

Extending fromthe frame A are brackets J, in which is secured a cross-shaft, K. Upon this shaft is journaled, between two collars, k, a hub, L, forming the base or point of meeting of the diverging arms H. The arm l is curved downwardly and forwardly to the tappet, upon top of which it rests. Its end is upturned to avoid interference with the tappet. The arm I extends from the hub at about right angles to the arm l-that is, downwardly-and is somewhatin the shape of an imperfect letter S.

The operation of the device is as follows: When the cam raises the tappet the arm I is raised with it and the arm I is drawn inwardly, its lower curve fitting against the back of the cam at the moment the cam relieves the tappet. In its continued movement said cam must force the arm 1 outward or backward again, by doing which the arm 1 is forced down uponthe top of the tappet and accelerates the drop or fall of the stamp.

By this construction the stamp must deliver its blow, because the cam cannot free itself from arm Z until it has forced it back completely, in which position the arm I must have forced the stamp to its limit of downward throw. At a low rate of speed the arms I 6 would play no part, as the drop of the stamp would be fast enough; but at a high rate the arm Z would be forced out quickly enough to force arm 1 down upon the tappet and speed the stamp.

From the first" impingement of the cam against arm 1 to the end of its contact there with the speed with which it is forced out increases, and the descent of upper arm, Z,1s

consequently increased, thus exerting its force upon the tappet to the very moment of striking the ore in the mortar, or nearly so, according to the height of ore in the mortar.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the stamp G, stem E. tappet F, operating-cam, and cross-shaft K, of the speeding device, consisting of the swinging journaled arms'l l, the former of which extends to and rests upon said tappet and the latter is adapted to be brought into impingement with the revolving cam at the moment In witness whereof I have hereunto Set my 10 when said cam relieves the tappet, substanhand. tially as and for the purpose herein described.

2. In an ore-stamp battery, the stamp 0, JAMES MAXEY MCFARLANDO 5 stem E, tappet F, cam-shaft G, and cam I, in

combination with brackets or supports J, eross- Witnesses: shaft K, hub L, and arms I Z, all arranged JOHN RICHARDS, and operating substantially as and for the pur- E. G. OTIS.

pose herein described. 

